Oil heater



N i v s;

rg sn'r BERNARD s. NELSON, or new ole-teens, LOUISIANA, essrenon 130 a. n. Locitnr'r &

tries CO. LTD, 0F KEV! ORLEANS, LOUISEANA, A GOPi-PQRATION OF LOUISIANA.

on. HEATER."

To aZZv/Jwniit may cmicern Be it known that I, BERNARD S. NnLsoN, a'citizen of the United States, residing at New. Orleans, in the parish of Qrleans and State of Louisiana, have iiwentedtcertairi new and'usefu'l Improvements in Qil Heaters, of which thefollowing is a specification. This invention relates toheaterspand primarily to oil heaters for use in connection preparation of Oll supplied to oil with the burners.

The general principle of the invention is based on the porcupine tube effect where the liquid to be'heated is made to pass through an inner pipe and toreturn on the outside of this heater pipe in the form of a thin film between it and the hot outer pipe.

The main object of the invention is to increase the efliciency of this type of heater. The 'efiiciencyof a tube type ofheater varies as some function of the velocity of the liquid through the heater tube, and a high velocity witha minimmnamount of heating surface is maintained in amulti-pass heater; the drawing hereinafter referred to in: detail, discloses a heater of the two-pass type,

which doubles the velocity for any given number of tubes.

Another feature of the invention is the heater head which comprises a single casting without any oil joints other than screw threads, and'designed for a multi-pass effect. The pipes comprising the heater tubes are somounted in this head'that they will be held concentric with respect :to each other, and small guide ears forged on the outer ends of the inner pipes maintain them concentric throughout their length thus forming a passage of uniform thickness for the oil film.

A further feature of the invention is the formation of the ends of the outer pipes of the heater tubes. The customary way to close these ends is to have a threaded joint and a pipe cap screwed on. In accordance with this invention the ends of the pipes are squared to fit a socket wrench and a reinforcing block forced on the inside and afterwards welded at the extreme end. In this way the tubes can be put much closer together than is possible when the pipe caps are used, besides obviating screwed joints.

Further details of the invention will ap- 22 and outer pipes 23.

Specification of Letters :utent. Pggfiigntgd hug, 29, 1922, "A lication filed itemize/1920. Seria1No.357,673.

pear as described inwonnection with the accompanying drawings, and hereinafter set forth andclaimed. 1

In the drawingsillustrating the invention, 1

in which similar reference characters 'indicate the same parts in the several; figures,

Figure 1' 1sa sectional view of 1 an *oil heater constructed in accordance with this inventionyshowing parts inelevation.

Figure 2 is a detail elevation of the end of one set of tubes; I Figure 3 is an end view thereof;

Figure 4 is a longitudinalsection on line stances, which comprises a single piece cast ing which has no 01] holes other than the screw threaded. apertures for receiving the supply pipes and heating tubes 'generally indicated as 11 and 12. This head has terior of the head has partitions 17 and 18 which provide chambers 19, 20, and 21, whereby a head is provided for a nulti-pass heater,-in this instance, a two-pass heater.

Theheating tubes 11 and 12 comprise sets of concentric pipes formed by inner pipes The pipes 22 are all mounted in the partitions 17 and 18,and the outer pipes.arethreaded into the inner portionlOQ'ofthe heater head 10. It will be noted that each set of tubes is held concentric at their inner ends by the concentric arrangement of the threaded openings which support them at their inner ends, and the pipes are preferably all provided with glycerine and litharge packing or the like at their jointswith the heated head and are adapted to withstand the pressure of the oil within them.

The inner pipes 22 are maintained concentric within the outer tubes23 at their 0 the heater head foroil or any desired 'sub- 7 threaded oil inlet opening 13; relief valve opening 14-; and outlets 15 and .16; The inand the guide ears 24 allow the pipes 22 to slide within pipes 23 to take care of expansion and contraction of the apparatus.

The outer pipes 23 are squared at their other similar process. Thus sealed ends are formed at allthe ends 25, and the tubes can be placed closer together than they could ordinarily if they were provided with the innerinternally threaded pipe cap, for the reason that the outside cornersof the square ends 25 will not require any more space than the circumference of the tube 23.

A heatershell 27 is fastened to the head 10 in any convenient manner. It is provided with threaded openings 28, 29, and 30, for the steam inlet, a safety iala-re, and an outlet for the steam and water of condensation within the casing. The casing is also pro vided with a bafl'ie plate 31 for directing the steam over the heating tubes 11 and 12.

In operation or the heater, oil to be heated enters chamber 19 through the opening 13, passes through the pipes 22 of the tubes 11 and passes by way of the annular space -be tween pipes 22 and 23vto chamber 19, thence through pipes 22 and 23 of tubes 12 to chamber 21 and out of the heater head by outlets 15 and 16. The tubes 11 and 12 are heated by means of live, steam or exhaust steam from any suitable source, passing into the casing 27 through the inlet 28 around the bafiie 31 down and out through the outlet or drain 30.

Itis obvious that the construction herein described and illustrated as the preferred embodiment of the invention is not limited to oil heaters but may be employed for other purposes, within the scope of the invention, where any eflicient heat or cold exchange or transfer device is desired, as torvexample a water. heater, steam or ammonia condenser, brine or oil cooler and whether the heat exchange tubes are vertical or inclined, or horizontal as shown.

What I claim is: i

1. An apparatus for exchanging heat comprising a single piece head having inner and outer walls having threaded apertures therethrough and formed with partition members extending between said walls and having threaded "apertures therethrough concentric with each oli the apertures in the inner wall ofthe head, tubes extending from the head consisting of outer pipes each sealed at one end and having their other ends threaded into the apertures in the inner wall of the head, and inner concentric pipes having their innerends threaded; into the apertures in said partition members and their. outer ends provided withintegrally formed and outwardly projecting ears whereby they will be maintained concentrie with the outer tubes throughout their length, and a shell extending over the tubes tastened to the inner wall of thehead and;provided with inlet and outlet openings.

Anapparatus for exchanging heat comprising a head -ha ting heatingtubes extending therefrom and a shell extending from the head and covering said tubes, said tubes con'iprising, sets of inner and outer pipes mounted concentrically in the head, said inner pipes having their outer ends open and formed with outwardly projecting, ears for engagingtheinner sides of theends of the outer pipes and holding. the, pipes in concentric relation throughout their length,said outer pipes having theirouterends squared to a size the distance between, the diagonal corners of said squared ends beingvsubstantially equal to the diameter of the outer tubes, a reinforcingblock forged in said end and the whole welded to form a practically solid sealed end.

In testimony whereof, I atlix my signature.

BERNARDS. NELSON. 

